EP0406011A1 - Aerosoldose - Google Patents

Aerosoldose Download PDF

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Publication number
EP0406011A1
EP0406011A1 EP90307153A EP90307153A EP0406011A1 EP 0406011 A1 EP0406011 A1 EP 0406011A1 EP 90307153 A EP90307153 A EP 90307153A EP 90307153 A EP90307153 A EP 90307153A EP 0406011 A1 EP0406011 A1 EP 0406011A1
Authority
EP
European Patent Office
Prior art keywords
lid
interior
gates
mounting bead
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90307153A
Other languages
English (en)
French (fr)
Inventor
Yoichi Ebina
Yoshimasa Ikeda
Masakazu Nakai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Polyplastics Co Ltd
Original Assignee
Polyplastics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Polyplastics Co Ltd filed Critical Polyplastics Co Ltd
Publication of EP0406011A1 publication Critical patent/EP0406011A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/38—Details of the container body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C45/2708—Gates

Definitions

  • the present invention generally relates to containers for containing and dispensing pressurized aerosols. More particularly, the present invention relates to aerosol containers having a generally tubular resin body closed at its lower end and open at its upper end, with an especially adapted molded resin cap assembly closing the upper end of the container body.
  • FIG. 1 shows a typical prior art aerosol container C1 which includes a generally tubular metal container body B having its upper edge curled to form a circumferential mounting bead MB that establishes a relatively large mouth opening MO at the body's upper end.
  • the mouth M is closed with a metal cap C which includes an aerosol dispensing nozzle N of a conventional variety for dispensing the aerosol contents from the container C1.
  • the metal cap C includes a circumferential mounting flange MF that is crimped onto the mounting bead MB of the container body B so as to provide a fluid-tight closure of the mouth opening MO.
  • FIG. 1 An example of such an injection-molded container is the container C2 represented in accompanying Figure 2.
  • This conventional container C2 includes a container body B formed of a suitable resin material.
  • a lid L also formed of a suitable resin material, is rigidly attached, for example via ultrasonic welding techniques, to the upper edge E of the container body B' so as to form a fluid-tight seal therebetween.
  • the upper end of the lid L is formed with a circumferential mounting bead MB'.
  • the metallic dispensing cap C may then be coupled to the lid L by crimping its circumferential mounting flange MF to the mounting bead MB so as to close the open end of body B'.
  • the present invention is directed to aerosol containers fabricated from injection-moldable resins, whereby the containers include a generally tubular body, an injection molded resin lid attached to an upper end of the container body and having a relatively thickened circumferential bead defining an open mouth, and an aerosol dispensing cap sealingly fixed to the bead of the lid and closing the defied open mouth thereof.
  • the present invention is especially characterized by providing at least three injection molding gates at a lower interior surface region of the mounting bead, whereby the molding gates are circumferentially spaced-apart from one another at selected intervals.
  • the present invention thus provides an aerosol container comprising:
  • the invention also provides an injection-molded lid for aerosol containers having an annular mounting bead to which a metal dispensing cap is adapted to being attached, and wherein the mounting bead includes an upper interior surface that defines a mouth opening, and a lower interior surface that is positioned radially outwardly relative to said upper interior surface, said lid further including at least three injection-molding gates circumferentially spaced-apart at selected locations relative to one another along said interior lower surface.
  • the invention provides a method of making a thermoplastic lid for an aerosol container of the type having an annular mounting bead to which a metal dispensing cap is adapted to being attached, and wherein the mounting bead includes an upper interior surface that defines a mouth opening, and a lower interior surface that is positioned radially outwardly relative to said upper interior surface, said method comprising providing a mold having a mold cavity corresponding to said lid and at least three injection-molding runners circumferentially spaced-apart at selected locations relative to one another, each said runner terminating in a gate located at a portion of said mold cavity corresponding to said interior lower surface of said mounting bead, injecting a molten thermoplastic resin into said mold cavity to form said lid, and then removing said injection-molded lid from said cavity.
  • injection-molding gates, and the associated runners are equally spaced-apart relative to one another along the circumference of said interior lower surface.
  • the present invention is characterized in an especially adapted injection-molded lid for aerosol containers whereby at least three circumferentially spaced-apart gates are employed during the injection molding process. Moreover, each of these gates is located physically on a lower interior surface region of the mounting bead associated with the lid as will be discussed in greater detail below in connection with accompanying Figures 4 and 5.
  • the injection molded lid 10 shown in Figures 4 and 5 is generally similar to the prior art lid L discussed above in connection with Figures 2 and 3. That is the lid 10 includes a base portion 12 having a horizontally disposed shoulder flange 12a and a vertically disposed mounting flange 12b that is radially inwardly offset relative to the flange 12a so as to define a space for accomodating the upper edge region 14 of container body 16.
  • the container body 16 is preferably formed of a resin material so that the lid 10 can be rigidly coupled thereby via ultrasonic welding of shoulder flange 12b and/or flange 12a to the adjacent edge region 14 of container body 16. In such a manner, the lid 10 will form a fluid-tight seal with the edge region 14 of container 16 about the entire circumference of the base portion 12.
  • the upper terminal part of the lid 10 is formed of a circumferential mounting bead 20 having an annular generally convex interior surface 22 that establishes the diametrical dimension of the open mouth 23.
  • the mounting bead 20 is joined to the base portion 12 of the lid 10 by means of a generally conical throat section 25. More specifically, the interior surface 25a of the throat section 25 is integrally joined with the convex interior section 22 via an annular lower surface 26 that provides a smooth transition between the convex interior surface 22 of mounting bead 20 and the interior generally conical surface 25a associated with the throat section 25. It will be specifically observed that the annular lower surface 26 of mounting bead 20 is positioned radially outwardly relative to the convex interior surface 22.
  • the number of injection molding gates employed during the injection molding of the lid 10 as described above is at least three. Moreover, these gates are equally circumferentially spaced-apart relative to one another. In this regard, it has been found that when less than three gates are used, the dimensional accuracy (roundness) of the mounting bead 20 results in lids that encounter difficulties in forming a fluid-tight seal between the mounting bead 20 and the dispensing cap and/or between the base 12 and the container body 16. Although improved dimensional accuracy (roundness) results when greater than three injection molding gates are employed, the costs associated with the injection mold as well as the strength and pressure resistance of the containers mitigate against the use of usually large number of gates. Therefore, the number of gates employed should be at least three but no more than eight.
  • FIGS. 4 and 5 schematically show possible gate locations when a plurality of injection molding gates are employed to form a lid 10.
  • three possible gate locations (designated A, B and C) each having three equally circumferentially spaced-apart gates are shown.
  • Gate locations A 1 -A3 are obtained via a so-called peripheral side gate technique and are positioned on the exterior surface of the vertical flange 12b and thus in facing relationship to an interior surface region of the container body 16.
  • gate locations A 1 -A3 are not included within the scope of the present invention as they may give rise to burrs requiring removal that could interfere with the fluid-tight seal between the lid 10 and the container body 16 at lid base 12.
  • Gate locations B1-B3 are obtained via a so-called pin point molding technique. As can be appreciated, while gate locations B1-B 3 do not interfere with any of the fluid-tight seals -- i.e., either between the dispensing cap and the mounting bead or between the base of the lid and the container body -- they are nonetheless visibly perceptible on the exterior surface of the throat region 25. As a result, gate locations B1-8 3 are outside the scope of this invention since the appearance of the lid is deleteriously affected.
  • Gate locations C 1 -C 3 are, however, within the scope of the present invention.
  • gate locations C 1 -C 3 are each positioned on the lower surface of the mounting bead 20. More specifically, it will be observed especially from Figure 5 that the convex interior surface of the mounting bead 20 establishes a nominal diameter P of the mouth opening 23.
  • the gate locations C 1 -C 3 are, however, located radially outwardly relative to the convex surface 22. That is, the diameter of an imaginary cylinder coaxially positioned relative to the mouth opening 23 and on which each of the gates C 1 -C 3 is located will have a diameter D 9 that is greater than the nominal diameter of P of the mouth opening 23.
  • the gates C 1 -C 3 are preferably physically disposed within radial recessed slots 28 formed in the lower surface 26 of the mounting bead 20 as shown in Figures 4 and 5.
  • the radial recesssed slots 28 will therefore "hide” from the dispensing cap structures any burrs that may remain after the gate residue is removed. As a result, the sealing fit between the dispensing cap and the mounting bead is not impaired.
  • a mold 30 that is used to form the lid 10 described above by injection molding is shown in accompanying Figures 6 and 7.
  • the mold cavities that are employed to form the lid structures described above are designated by a prime () following the reference numeral.
  • the mold 30 includes a mounting bead cavity 20 which defines an inner surface 23 corresponding to the mouth opening 23.
  • the inner surface 23 be substantially perpendicular to the mold parting line 15.
  • the inner surface of the lid to be formed by the mold 30 will not be convex as described above with reference to Figures 4 and 5.
  • the mold shown in Figures 6 and 7 depicts an alternative to the convex interior surface described previously. -- i.e., a generally cylindrical surface. Notwithstanding this difference, the gate locations will be below and radially lateral to the inner surface of the mounting bead 20.
  • a central inlet 32 is provided so as to introduce molten thermoplastic material into the cavities of mold 32.
  • the inlet 32 includes a number of radially oriented runners 34 that are equally spaced apart relative to one another.
  • the terminal end of the runners 34 i.e., forming the gate locations Ci - C 3 , respectively
  • the gates will be formed within the radial slots 28 as described above.
  • the thickness T 1 of the formed gate is preferably between about 50-60% of the average cross-sectional thickness T 2 of the lid 10.
  • any injection-moldable thermoplastic resin may be employed to form the lids according to the present invention.
  • Preferred resins include homopolymers and copolymers of polyoxymethylene.
  • Particularly preferred resins include homopolymers and copolymers of polyethylene terephthalate.
  • the injection-moldable resin may include an inorganic filler material, such as a fibrous inorganic filler e.g., glass fibers.
  • an injection-molded lid for an aerosol container with at least three gates circumferentially equally spaced-apart from one another at the lower interior surface of the lid's mounting bead, the dimensional accuracy (roundness) of the lid can be improved. As a result, lids with reliable fluid-tight seals between the lid and the container body or the dispensing cap may be obtained. Furthermore, since the gates are located within the radial slots, there is no need to remove them physically. Thus, production costs associated with the lids of the present invention are lower than those of the prior art resin containers.
  • Each of the containers had a metallic dispensing cap that included an aerosol dispensing valve associated therewith and coupled to a container body.
  • Each container had 50g propellent charge (a mixture of Fluon with LPG) and was allowed to stand for thirty days in a heated furnace environment having a temperature of 45 C. At the conclusion of the thirty days, the number of containers having a reduced weight (indicative of propellant leakage) was counted. A hole was made in the containers identified as being of reduced weight, and pressurized air at about 500kPa (5 kg/cm 2 ) was blown into the container through the through the hole so as to elevate the internal pressure thereof. The air- pressurized containers were then held in water to detect leakage and to confirm the part of the container through which the leakage was occurring.
  • Resin lids 10 as shown in Figures 4 and 5 for an aerosol container were produced by injection molding.
  • the number of gates at the lower interior surface of the mounting bead of the lids varied as noted in Table 1.
  • the roundness of the inner diameter P of the mouth opening of the lid and the roundness of the outer diameter Q of base 12 to be ultrasonically welded to the container body were determined.
  • the resin used in these Examples was a polybutylene terephthalate resin containing 10% by weight of glass fibers.
  • the molding conditions used included a resin temperature of 255 C, a mold temperature of 65 . C, and a mold cycle of 20 seconds.
  • the molded lid was then welded at its base to a resin container using ultrasonic welding techniques to form a resin container.
  • the container was then charged with a propellent and leakage determinations were made. The results are shown in Table 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Closures For Containers (AREA)
  • Nozzles (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
EP90307153A 1989-06-30 1990-06-29 Aerosoldose Withdrawn EP0406011A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1168742A JP2749640B2 (ja) 1989-06-30 1989-06-30 樹脂製エアゾール容器
JP168742/89 1989-06-30

Publications (1)

Publication Number Publication Date
EP0406011A1 true EP0406011A1 (de) 1991-01-02

Family

ID=15873575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90307153A Withdrawn EP0406011A1 (de) 1989-06-30 1990-06-29 Aerosoldose

Country Status (7)

Country Link
US (1) US5083684A (de)
EP (1) EP0406011A1 (de)
JP (1) JP2749640B2 (de)
KR (1) KR930009951B1 (de)
CN (1) CN1023468C (de)
BR (1) BR9003053A (de)
CA (1) CA2020274A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5346659A (en) * 1992-11-23 1994-09-13 S. C. Johnson & Son, Inc. Method for producing a weld-line free injection molded plastic container body portion
WO2009124994A1 (de) * 2008-04-12 2009-10-15 Voss Automotive Gmbh Verfahren zur herstellung eines formteils mit ringförmigem querschnitt und formteil nach einem solchen verfahren
EP2281758B1 (de) * 2008-04-25 2016-07-27 Toyo Seikan Group Holdings, Ltd. Struktur des clinchbereichs eines ventiltellers

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2740527B1 (fr) * 1995-10-31 1998-01-02 Valois Tige de soupape a faibles frottements
FR2793478B1 (fr) * 1999-05-11 2001-07-27 Oreal Dispositif de montage d'une valve sur un reservoir, et distributeur contenant un produit sous pression, equipe d'un tel dispositif
US6276569B1 (en) * 2000-09-12 2001-08-21 Chun-Lung Tsai Liquid container press bottle cap
US20060060554A1 (en) * 2004-09-20 2006-03-23 Garman Thomas B Blow molded plastic aerosol container
MY151140A (en) * 2004-09-23 2014-04-30 Petapak Aerosol Internat Corp Plastic aerosol container and method of manufacturing same
CA2739565C (en) 2008-10-06 2016-10-04 Valspar Sourcing, Inc. Actuator for spray container and method regarding same
JP5858279B2 (ja) 2011-12-05 2016-02-10 トヨタ自動車株式会社 リチウムイオン二次電池
CA2916842A1 (en) * 2013-06-28 2014-12-31 Oxygon Technologies Inc. Plastic aerosol containers
SE1451109A1 (sv) * 2014-02-28 2015-08-29 Purple Holding Ab Stabilizer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814952A1 (de) * 1977-04-06 1978-10-19 Du Pont Verfahren zur herstellung eines vorformlings fuer eine aerosolflasche
FR2498119A1 (fr) * 1981-01-22 1982-07-23 Alizol Sa Perfectionnements apportes aux procedes et aux moules pour le moulage de pieces en matiere plastique souple ou semi-souple presentant des parties de dimensions tres differentes et pieces ainsi obtenues
EP0186413A2 (de) * 1984-12-21 1986-07-02 Tanner AG Einrichtung zum Spritzgiessen von Kunststoffen
WO1989005773A1 (en) * 1987-12-22 1989-06-29 Abplanalp Robert H Improved valved plastic pressure container

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333743A (en) * 1966-01-11 1967-08-01 Meyers Frederick Charles Plastic container and valves for storing and dispensing pressurized products
US4261473A (en) * 1975-12-17 1981-04-14 Toyo Seikan Kaisha Limited Molded container having wall composed of oriented resin blend
FR2441778A1 (fr) * 1978-11-17 1980-06-13 Aerosol Inventions Dev Ensemble de distribution et remplissage pour recipient aerosol
JPH0335399Y2 (de) * 1985-11-08 1991-07-26

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814952A1 (de) * 1977-04-06 1978-10-19 Du Pont Verfahren zur herstellung eines vorformlings fuer eine aerosolflasche
FR2498119A1 (fr) * 1981-01-22 1982-07-23 Alizol Sa Perfectionnements apportes aux procedes et aux moules pour le moulage de pieces en matiere plastique souple ou semi-souple presentant des parties de dimensions tres differentes et pieces ainsi obtenues
EP0186413A2 (de) * 1984-12-21 1986-07-02 Tanner AG Einrichtung zum Spritzgiessen von Kunststoffen
WO1989005773A1 (en) * 1987-12-22 1989-06-29 Abplanalp Robert H Improved valved plastic pressure container

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5346659A (en) * 1992-11-23 1994-09-13 S. C. Johnson & Son, Inc. Method for producing a weld-line free injection molded plastic container body portion
WO2009124994A1 (de) * 2008-04-12 2009-10-15 Voss Automotive Gmbh Verfahren zur herstellung eines formteils mit ringförmigem querschnitt und formteil nach einem solchen verfahren
US9023260B2 (en) 2008-04-12 2015-05-05 Voss Automotive Gmbh Method for producing a screw part with an annular cross-section
EP2281758B1 (de) * 2008-04-25 2016-07-27 Toyo Seikan Group Holdings, Ltd. Struktur des clinchbereichs eines ventiltellers

Also Published As

Publication number Publication date
BR9003053A (pt) 1991-08-27
CN1023468C (zh) 1994-01-12
KR910000489A (ko) 1991-01-29
CA2020274A1 (en) 1990-12-31
KR930009951B1 (ko) 1993-10-13
CN1048365A (zh) 1991-01-09
JPH0332757A (ja) 1991-02-13
JP2749640B2 (ja) 1998-05-13
US5083684A (en) 1992-01-28

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